448 was running really well for me and this build so far is just as good (approx 17hrs). Mind you, there are memory leaks in both builds, and while on 448, I had to reboot every 5 days or so. Battery life has been consistently good and reboots are quick. OS 5 (every build and beta until OS 6 released) on my device was horrible and took roughly 9.5 mins whenever I rebooted.

I have 15 apps installed and just over 15MB of memory (forgot to check upon fresh reboot)